Abstract
Sialon was produced by hot-pressing the mixtures of Si₃N₄, AlN and Y₂O₃ powders. All fracture tests were performed on a three-point loading system with a 30 ㎜ bending span. Fracture toughness and Vickers hardness of smooth specimen were average 7.05 ㎫ m<SUP>0.5</SUP> and Hv = 1580, respectively. Density of three kinds of specimens, smooth specimen, smooth and healed specimen, smooth with SiO₂ colloidal coating and healed specimen, had beyond 99 % of theoretical density. Bending strength of smooth healed specimens had high strength more than 1 ㎬. Crack healed specimens recovered as strength as smooth specimen. That is, cracked specimen with SiO₂ colloidal coating on cracked part recovered strength by heat treatment, completely. Crack healing of Si₃N₄ composite ceramics had contributed glassy SiO₂ to strength recovery. Limiting high temperature for bending strength of heat treated smooth specimen for bending strength was about 1273 K.
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